with his weight dropping, jobs admitted in 2003, he had cancer, revealing he had surgery to remove a tumor. in 2009, he had a liver transplant. >> the pancreas, the gallbladder, the liver are all closely connected and function together. so it may be that the liver transplant was related to the cancer. >> reporter: dr. bruce hencele says 94% of pancreatic cancer patients die. just months ago, jobs was dining with the president, but looking frail. >> weight loss sin detective of a cancer getting worse, especially a cancer in the digestive area. the pancreas is responsible for many enzims, as well as insulin, and weight loss can be related to that and to liver problems. >> reporter: while jobs says he will be the chairman of the board and active in apple's future, experts say stepping aside is not a good sign. >> this is worrisome.